String json1 = "{\"reason\" : \"business\",\"airport\" : \"SFO\"}";  
String json2 = "{\"participants\" : 5,\"airport\" : \"OTP\"}";

JavaSparkContext jsc = ...
JavaRDD stringRDD = jsc.parallelize(ImmutableList.of(json1, json2)); 
JavaEsSpark.saveJsonToEs(stringRDD, "spark/json-trips");